Development in invasive prenatal diagnostic techniques

Fetal in utero diagnosis,that is,prenatal diagnosis,means diagnosis of those abnormal babies with congenital defect or inheritance disease before their delivery.Interventional in utero diagnosis,also called invasive prenatal diagnostic technique,is more safe,reliable and efficient under direction of B-mode ultrasonograply.Invasive prenatal diagnostic techniques include amniocentesis, chorionic villus sampling(CVS),fetal blood sampling and embryoscopy.In this article,we introduced the procedures of these methods and compared and discussed their indications.